Sale of Flight Training Operations - Additional Information (Detail) (USD $)	12 Months Ended
Apr. 30, 2011
Sale of Flight Training Operations [Line Items]
Proceeds from the sale of the flight training operations to CAE Inc.	$ 29,779,000
Net proceeds on sale of four flight training simulators, software, and customer contracts	17,700,000
Inducement to enter into Master Training Services Agreement	$ 12,100,000
Service agreement period	15 years

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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- Definition

The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy.

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